Storks are a group of large wading birds with long legs, necks, and stout bills, classified under the family Ciconiidae and order Ciconiiformes, consisting of 19 living species across six genera. While they inhabit a variety of regions, they favor drier environments over the more aquatic herons, spoonbills, and ibises, and are known for their bill-clattering communication and migratory habits. Their diet is diverse, including frogs, fish, insects, earthworms, small birds, and mammals. Group names for storks include a muster or a phalanx. These birds are notable for their soaring flight that conserves energy, and some, like the marabou stork, rank among the land birds with the widest wingspan. Storks build large nests, often reused annually, and show a degree of monogamy; some may change mates seasonally or migrate alone. Their size, nesting loyalty, and prominence in many mythologies and cultures make them significant symbols across the world.
Although all stork species have been assessed for conservation status, gaps in knowledge about their habits suggest further research is needed. Storks vary in size from the smaller Abdim's stork to the towering marabou, with some dimorphism present in the sexes. Their bill shapes are highly adapted to their diets, from the generalist Ciconia to the snail-specialist openbills. Contrary to some reports, storks do have a syrinx and can make sounds, though not commonly.
Storks are nearly cosmopolitan in distribution, absent from polar regions, most of North America, and parts of Australia, with diversity hotspots in tropical Asia and sub-Saharan Africa. They adapt to a range of habitats, from wetlands to savannahs, and show varying degrees of migration, with some species undertaking long journeys to avoid winter.
In terms of behavior, storks are carnivorous, hunting a spectrum of animals, with methods adapted to their environment and prey. Breeding behaviors vary from solitary to colonial, and while some nest alone, others form large communities with different waterbird species.
Stork taxonomy indicates that their family is the sole group within their order, with a fossil record stretching back to the Oligocene, approximately 30-40 million years ago. Current comprehension of storks is limited, and more data is needed for accurate conservation assessments.
The etymology of the word "stork" is tied to Proto-Germanic, ancient Greek, and other language families, each denoting specific attributes or mythologies of these birds. In folklore and literature, storks are often associated with delivering babies and feature in various tales that highlight their characteristics and cultural significance.